Improve re-usability of Editor Lite

What does this MR do?

This MR improves re-usability of the Editor Lite Vue component by removing the expectation of a certain HTML hierarchy on the page in order for the style to work properly. The problem has been identified while implementing the component for CI linting Vue application

Screenshots

NOTE: At the moment only Snippet form is using the Editor Lite as a Vue component so the table below makes sure that both the Vue component and vanilla Editor Lite (implemented without Vue) are still looking exactly the same after this MR.

	Before	After
Blob edit
Snippet edit
CI lint

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done